DIY Wood Fired Hot Tub
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- Опубликовано: 5 янв 2025
- Full instructions for this DIY Wood Fired Hot Tub made from a galvanized stock tank are coming soon to HomeMade-Modern.com
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link to the stock i bought for $130 www.behlencount...
links to the fittings i used: www.mcmaster.c...
www.mcmaster.c...
I completed this project today just as you explained. It is currently 28 degrees so it is taking me a bit longer to heat up. I did put a cover on and tarp to contain some heat. Great video. I am an arborist and own and operate a tree service so I have plenty of wood to burn. I will definitely enjoy a hot tub when I'm at 10,000 feet in my off grid cabin. Thanks for sharing the great info.
Nice video. This concept and design has been around for years.
My thoughts/comments are: 1) If you're going through the whole process of making forms and pouring concrete, just make 1 form and make it for the entire size of the tank. Better stability, less chance of the pads coming through bottom of the tank. That's how stock tanks are designed to work. 2) For the heater, build and actual fireplace around your copper pipe and increase the number of coils. That will get your temperatures up and more constant. 3) To retain heat, wrap the tank in insulation and make a decorative outer wrap.
Good information tho! 😁😁😁😁
This was pretty well thought out. One serious thing though, because of electrolysis between dissimilar metals there can eventually be corrosion between the copper tubing and steel bars. If you use stainless steel instead for the steel bars it will be ok.
I built my own also and used boiler tube and enclosed the heating coils in a large piece of pipe. It heated fast and after it got hot it took very little fire to keep it warm. Good job!
Can't help but chuckle a little of how this reminds me of Looney Tunes where they'd lure someone in thinking it was a hot tub and really be making them into a stew. haha. Looks relaxing! And also looks good for ice baths.
the stock tanks come with a built in drain and plug that a hose can screw into. nice for watering the garden after a long soak.
but how does the water circulate? and also.. there was a girl in the bathtub, you shrek ! you transform by night or what?
Thermosiphon is how the water circulates. Cold water is dense, heat rises, creates a natural circulation.
Thumbnail girl: i.ytimg.com/vi/HMjpWlgcK-M/maxresdefault.jpg
yellow2000SR
that is pretty cool, thank you :-)
alaskan bush people just copied this
flyback 2me
what are you talking about? who's hawk?
Super well done!! A huge amount of heat loss is from the ground/concrete/sand, put some foam insulation under it to keep it warm longer and less fuel to hear it.
Chickens need small rocks for their crawp (gizzard), to grind their food. That's why they were interested in your gravel. Feed and Seed stores sell grit for chickens, as well as crushed shells for calcium for egg shells. Love the tub!
Can't wait to play with this idea. Been wanting to make and outdoor hot tub for a while. Thanks Ben.
Quick suggestions. Change the steel/iron support bars to copper if you are going to leave it outside. The dissimilar metals will start corroding much faster then if they are the same metal. The other solution is wrap the copper tubing around something that is being heated by the fire. This will allow much better heat transfer into the water so you can wrap more more turns and have more hot water. Great video and concept.
Did you work on aircraft?
we rinsed off the chickens feet :)
HomeMadeModern maybe try building a cob oven around the coil, which would greatly increase the efficiency
And that is why I love you.
HomeMadeModern z
You are a good human!
great vid! and, also good display of great carpentry skills bruh! I am jelly
A friend did that with a bigger tub for 2. She set it on the ground, filled it with water, dug a small hole at one end and built a very small fire in the hole. Worked great.
Great vid, the inlet at the top of the tub if you put a 90* on it with another section of copper down into the tub.
the terminal siphoning would push the water. So your hot water would enter the tub from the bottom, Evenly heat the tub
Yeah very nice. I've been wanting to do one of these for about 7 years now. Never got around to it. I'm glad to see it tried and tested and successful. I have been wanting to make the same thing for my pool, to begin and extend the season here in New England.
This is why when building a home you put your wood burning stove directly on the other side of you bathroom/shower/tub. If you have a shared cement or rock wall to hold heat between the stove and the shower as well as run hot water or copper tubing through the wall and into a gravity fed water heater you get free hot water while you warm your home in the winter :)
Is there any way to adapt this basic concept into a pre-existing in-ground spa?
Here are a few ideas you, or someone making this, may find useful.
You could wrap the copper around 8" Duct Pipe from a Stove and move this unit inside. Also you could make more loops closer together so it heats the water faster.
Having the copper wrap around the Stove Pipe would keep the smoke at bay and allow the heating to be a bit more efficient. Depending on the Drum you use for the Burner, you may want to make multiple Copper Runs to Multiple Stove Pipes to allow for faster heating of the water, perhaps a copper pipe for each side.
Also you may want to install some sort of circulation pump to move the water a bit faster to keep hot spots from taking place.
Or you just might want to put a Pound Pump in the Tank to just circulate the water that way. Of you could must make a Copper Run, two connectors at the bottom with a Circulation Pump only, to circulate just the Tub Water so that is move the Cold Water constantly.
Great Project....
good ideas! thanks!
When I was a kid in Croatia we had a wood-heated bathtub where there was a water tank (similar to today's water heaters you find in your basement, but only about a foot in diameter). There was a place to put the wood in right uner it. When the water was hot we filled the bath. The tank kept filled up and kept heating as the wood burned. Great baths, never this much wasted wood. Was too young to remember the other details of it.
Dude great idea, I feel justified because I did similar project.. I have no neighbors so I bathe outside all the time!.. I made a tighter heat-riser coil so it would fit into a stovepipe, mounted on a stove made from a propane cylinder.. tempted to plumb/heat my house same way!.. A plus with using a little stove is that you have control of your fire/coals.. Nice!
What a cool idea, It's easy to do and the design is very flexible. The way things are going globally this could be the bathtub of the future!!!! 😂😂😂😂😂😂
Been using one of those tanks for several years, but I just set it up on rocks and build a fire underneath it. After all it's a metal tank. But I do have to rake the fire out before getting in and then have a limited time to stay in, unless I want to make a grid floor to sit on above the bottom which I haven't. After a number of years use the seams got to leaking a bit too much so I caulked them. Eventually I'll make a better one for more people, since the oval tank is only large enough for 2.
Great idea. Add a check valve to the bottom side of the pipe. This will help when pressure is built up and push out the hot water to the top. Don't know if they make a cooper check valve. But could use a regular pvc bc the heat isn't much on the intake side. Excellent vid👍🏽👍🏽
I've always wanted an outside tub...ever since the FALL GUY tv series! !!!love it man 👍👍👍
I was living off the land on Maui in 1976. When invited up to Haiku to stay in a reconditioned chicken shack I discovered the fudo tub. Japanese by design, it was a ferro cement vessel with copper sheeting on the bottom. You could hack up some wood with a cane knife and start a fire right under it. It also had a big hollowed out bamboo cane, on a swivel, to emit overly hot water and a tap to add cool. After camping on the beach and up in the jungle, all my aches and pains were gone in about 15 minutes.
Awesome project. It's a good thing you have that tall fence or your neighbors would think you're crazy lol
I love how people with tiny yards are the most creative.
Pretty cool man!
thanks! love your projects!
DIY Creators I am subscribed to both you guys 😁😁😁 you both have awesome projects keep up the great work👍👍👍
Pretty cool huh
Why not add a valve to stop the circulation of the water. That way you can "control" the temperature of the water by reopening and closing the valve.
I thought about this and will test it but was worried that the coils would get too hot.
that's not the worst concern, if someone tries to isolate the coil trough valves the water inside it would transform into steam and make the coil explode! it could work if you drain the coil or move it out of the fire trough flexible tubing
you need to keep water moving through the coil, i use a similar coil on my home built maple syrup evaporator , great job on this - eric.
you can make the coil exploit because of the increasing pressure of the water vapor.
You could also add a pressure relief valve.
Ahhhh! watching the chickens zoom around makes me sooo Happy!
Great idea the question why is it if you stop the video at 4:10 it does not look like it's one big coil going from top to bottom it looks like it's all separated and pinched off
Try insulating the tub.
You can also create an inclosure for the fire and extend a chimney
increase the amount of pipe exposed to the fire and insulate the rest
good idea!
That's exactly what I was thinking. I nice cedar enclosure for the tub and a clay chiminea for the fire. They burn a lot longer so you would get a lot more time out of the firewood and safer in windy conditions. This way you could close the door to dampen the fire to turn down the heat. But the basic concept of using the copper tubing is really the heart of the idea. Fun I idea to develop further.
Excellent idea! Hot water from the fire! Super!
Cool, but I want to see a wood fired infinity pool next ;)
Jackman Works or a Lazarus Pit!
I think using a heat shield to protect your copper from direct flames would help it to last longer, as well applying a spray in liner to the stock tank would make it more comfortable and prevent rust.
Man I could really use one of those right now. This would be great after long hours of work.
This is going to be the next project I do! I've been planning it for a little while but this one is heaps simpler than what I was planning.
awesome! share some photos with us when you do :)
HomeMadeModern for sure! I was planning to have it done by now but it's been pushed down the things to do list... maybe next month!
Dig a hole underneath the tank, fill it up with firewood and that's it!!
the metal of the tub would conduct heat differently than the water
I did the same. It's just like heating a pot on the stove, only scaled up. Except I raised the tub on old steel car rims. I could have cooked a stew for the whole neighborhood, it was that effective.
hhhhh
*****
My tub had a valve on the end. All I had to was open it and wait a minute or 2. Empty tub. (and fire totally extinguished).
Double Dare Fan
that
sounds
delicious
At my friends cabin there is a regular fiberglass hot tub and have the copper coil/wood fire as the heat source. Works great.
The enclosure for the fire would also probably help you regulate temperature better. You could have a door which allows heat to escape when open, or maintain it when closed.
Very interesting! Everyone on youtube has inspired us to start our own homesteading channel. One day I will have a hot tub!
Maybe you can add a small water pump so it can recirculate way faster?
yes! good idea
You probably will need a temperature gough, so you don't crash a water pump.
Евгений Baltmaster Let the pump Pump the water to the coil, then the pump pumps colder water.
Excellent proof of concept, refinements to come.
I used the flux capacitor from my Dad’s old DeLorean to help pump the water faster. Now it’s November 2018.Does anyone know how to get me back?
I wonder if you made a rocketstove and piped the copper tube around it. would that help?
A Czech friend of mine did something similar but had done it with a small above ground swimming pool and the water was circulating through the pools Pump . The coil of copper pipe were in the fire box of his home made smoker . So while waiting for freshly smoked meat and cheese we had a pool party in winter . Czechneck engineering was my comment !
freddy c velki didinki
Czechneck! LMAO instant classic.
I have some 3/8th in tubing if I use that will it take longer to heat the tub?
I like it, came out great. Probably didn't need to do all that extra work with the concrete pads. I would have removed 2-3" of soil, tamped the soil, then applied a layer of gravel followed by a layer of sand. That tub wouldn't move. The only problem, is having to smell smoke while enjoying that hot water.
pink foam underneath, and spread in/out, say you stove take vertical 33gal barrel wood stove, put lg coppipe on bottom of the tank, any valve to reg flow goes this side then pipe gets slightly smaller, could add find to pickup more heat, or just add flame with chimney under tube(mini-rocket stove to bring up 180gals first GL good stuff, I own/made one of these
Put the copper coil inside something like a rocket stove made out of an old propane tank or old hot water heater. Maybe even coat the inside of tub with porcelain and enclose outside of tank with wooden box to help insulate tub. Maybe even sit the tank inside a wooden box and leave a couple inches on all side and then fill with spray foam?
good ideas!
Simple science. Effective. Great for off grid. A drain valve on the tub would turn it into a heated bath tub (using a smaller tub). The coil heating system has several other possibilities too.
@ 2:21 is the first mistake.
The heating coils should dump hot water into the bottom of the tub on one end and should draw from the top on the other side.
The way he is doing it is like a hot water heater that you draw hot water from for filling a tub, so the hot water up high should not mix with the cold water below and you draw your hot water from the top only.
To keep the tub hit the hot should enter from the bottom mixing with the cold to keep the tub warm top to bottom.
The reason that the water flows into the copper tube at all is due to hydrostatic pressure. The means that the pressure increases linearly with depth. The tube cannot "dump hot water into the bottom of the tub" because its pressure will be less than the pressure at the bottom of the tub. Water in that case would flow in the opposite direction. There is no pump here at all. The only thing driving the flow is hydrostatic pressure. There is only one way for the flow to go.
archangel20031 I’m pretty sure the laws of physics would disagree with you.
You’re right, BUT he would have to add a whole extra piece to his basically 3 piece hot tub, a pump. He only did it this way because the water naturally flows without a pump because of heat
Can you do this to a regular pool? To keep the pool warm? Itd be easier than all the work with tubing...
I've done this with my pool about 5 years. Pretty shocking how well it works
did that myself many years ago with an above ground pool. wrapped copper around a 20 gallon tank, which was the firebox and shoved it into a 55 gal drum to contain the heat.
The best part of this video were the chickens
yes, they're pretty awesome!
no, It was his getting his shit off, hahahaha JK
I like how they pecked at the gravel for a nanosecond. :)
BOCK BOCK
Linda FG gimmie some money
Thanks for doing it in fast motion, saves a lot of time. I don't have 'unlimited'' data or time. Thanks again.
That's a cool idea, Ben. Nice one.
thanks Sean!
good job on tub. in past life when i was indian called gray squirrel simple put fire under stock tank had raised up on cement blocks. basically i roster self like lobster in tank. Your tank looks like control heat better and use way less wood then i did. In winter it chilly jumping in and out special if water hotter then want then get out snow. will wake you up.
This is a great idea, I will be buying one to do the same. I was wondering, is it okay to use sea salt or will it corrode the tub? Also, will it leach lead?
Did you tried canging the sides of coil. Like the top output of the coil head to the bottom of the tub? I think it would make the heating process more efficient.
You have such a talent! Loved the creativity of this project. Big fan!
This is an awesome proof of koncept. Right on man.
Interesting build. If I do something like this, I will probably build a rocket stove and could the copper around it. I think the rocket stove may be a little more efficient than an open fire.
i agree! will try it
Did a rocket stove but you have to constantly ad wood . It's easter to do a burn barrel stove and let er burn .
my grandpa had something similar in his backyard and always wanted to recreate it. thank you so much.
you looked much more attractive in the video thumbnail.
J. M. Pérez XD lol
Seriously underrated comment.
That's called marketing .....lol
Do you have to drain the tub after a few uses? and do you fill the tank then light the fire? Don't understand how it circulates without a pump, is it just because the hot water rises and then dumps into the tank?
Iron rods and copper tube... bad combination. Sureley corrosion will start accelerated by heat transmission.
hi
I like the idea but if you want to make it in large scale it's worth?
like if you want to heat up a small cheep house you can do it?
i dont know why but i found the chickens pecking at the gravel very funny
I love it when i see you tubers from the bay area
Toss in your chickens and a few vegetables and you have yourself a chicken stew! lulz...
Very nice!
Animal abuse!
Xavier Mondragon Jr fuck you dude
Xavier Mondragon Jr cooking!*
Elazul2k in the same tub ;)
You need to have to return pipe come in near the bottom of the tub..since heat rises...and the pipe that leads toward the coil take water off the top of the tub. possibly consider a small pump...and maybe consider a little solar panel to power the pump...maybe some kind of outdoor floodlamp kit from a home improvement store. awesome tub though...wish I had one.
I think more coils and a tighter spiral would also increase efficiency.
Bigger tub and a submersible ca stir on stove ad a couple of jet got a jacuzzi . It's been 15 years , thanks for showing up
seems this would be good for an off-grid situation.
you can put fins on the copper tubing to increase heat exchange surface and put the copper tubing inside an enclosure to keep the heat inside
now add onions, carrots, some herbs...........
How many liters of water does the bathtub have? and how long did it reach the final temperature? Thanks
Now make a comfortable seat for the hot tub.
yes! i was thinking of a tropical hard wood slatted seat.
HomeMadeModern or maybe someting softer that goes under your back, and bubles?
A back rest would be a bonus
I've built a heater like this. Only I had mine coiled inside a metal drum and I added a chimney to keep the smoke out of the way
I love this, it's like luxury in a simpler time. Beautiful😘
I'm wondering if you could also buy a slightly larger stock tank and put one inside the other and fill the gap with expanding foam to insulate it. That might also make the whole thing more efficient.
My favorite part was the chicken running around. haha they looked soo cute ! ..but yeah that was awesome
they're one of our adorable animal helpers :)
In 1967 my father took me on one of his yearly hunting vacations for the 1st time, elk hunting in eastern Oregon. Him and 5 of his buddies had been doing this for many years. Get away from the wives, drink, tell lies, shoot guns, and usually fill the freezer with meat of one kind of another, plus the hides, feathers, leather, eye teeth, antlers... even deer leg tendons dried and scraped and used as a toothpick. I never liked the killing but did use everything that nature and my dad provided. These guys didn't do it to prove they were tough or for attention, quite the contrary. They didn't rough it one bit. There was a campfire going 24/7 at camp, sitting next to it was a 30 gal. aluminum pot with handles and a lid. My dad had tapped the pot and mounted brass hardware so a 4' long 3/4 inch copper loop could be mounted and placed in the fire. The pot was always being refilled and kept on the edge of being too hot to use to wash, in other words... perfect. I like your concept with a couple of modifications. I think the hot (exit) end should be under the water surface it still circulates just fine. And, your plan doesn't take into account the inevitable tsunami that is going to occur when things turn... frisky? A drain into a nearby water feature that can filter grey water would be nice and the chicken wouldn't mind at all. Design a system that feeds pellets into a brick chamber holding the copper tube and save a ton of wood. Good job.
You should make a rocket stove for this. It's way more efficient on wood.
Michael Criswell I agree, a rocket stove would be the more effective way to go and it would look awesome.
I was thinking the same thing. I'd build it up so you add the sticks(not logs) right at the edge, so you can feed it while in it.
I've seen sweet pizza ovens using a rocket stove to heat it instead of the standard bonfire. They got it to +900°F in 30 minutes instead of 2 hours.
Oh- and no smoke! (if built like a true rocket stove)
Good intent.
You need to isolate the copper tubing from the steel supports otherwise galvanization will occur and the tubing will disintegrate where the two unlike metals are in contact with each other.
where's the girl from the thumbnail.... 😁😁😁
clickbait 😂😂😂
i wanted to ask as well :D anyway good idea :)
she is my little sister and helps with my projects. She has her own channel ruclips.net/channel/UCYqp3_iQYErWMi3VsVT5xzA
+HomeMadeModern oh lol. Just kidding
HomeMadeModern that link is broken on youtube app for ios.
I'm not quite understanding the dynamics. What force makes the water circulate and do you just start with a tub of water that you pumped in with the garden hose? What makes it circulate around. Sorry don't know thermodynamics one bit. Would it be possible to build the coil into a chimney, and then it would be protected and you could load the wood around the coil thru chimney front opening and top as it burns down? Any way to do this, for aesthetics and to retain the heat?
actually spellchecker did it again, I was saying "chimnea" ...
Love how you just have chickens roaming around in these videos
We use concrete edging around the fire so that it's more like a firepit. This holds the heat and is safer, especially on a windy day. The tub doesn't stay warm enough in colder weather - some type of insulation is needed.
Did you insure yourself from having the copper stolen? Here in Italy it gets stolen from the railway infrastructures as if it were Gold.
Lorenzo Notarianni that's about €60-100 max worth of copper here
I'm in the midst of building a cabin (We've been hampered by bad weather felling trees and just about every weather mishap you can imagine) the cabin has a shower/toilet room but I think that this idea would be great after a day of freezing in Scotland. ..I think I would build an outhouse with access from the cabin and perhaps fit one of those home made propane tank woodstoves with the coils...I reckon that would keep the outhouse and the water nice and warm. ..I think this is a fantastic idea. .Thanks x
....make a clay stove around the existing copper coil. Your efficiency on wood burning and temperature will rise dramatically.
Genuine question. Every time you use the tub, do you refill it each time? Or do you leave the water in after each use to refrain from using too much water?
immortalized chickens - amazing :D
In the 80's when I worked on harbor tugs, some of the boats had what looked like wood burning stove's that ran on diesel oil. On the side with the burner there was a single coil of copper that led to a probably 15 gal tank on the opposite side of the bulkhead and the same set up with just convection to circulate the water. On long days you'd have to be careful because the hot water coming out of the tap would be hot enough to scald you.
Now build a robot that puts wood in the fire automatically!
Have a log burner to heat the house at same time?
Aaawww he is so sweet to the chicken. My kind of man right here!!
Is there any other materials that can be used besides a metal trough, for some houses it would look great but to mine it would stick out like a sore thumb